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Why do mosquito bites itch and swell?

bites itch mosquito swell
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Why do mosquito bites itch and swell?

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The itching, swelling, and burning from a mosquito bite are caused by the body’s autoimmune response to the mosquito’s saliva that is injected when she feeds. Her saliva contains anticoagulating agents that prevent the victim’s blood from clotting while she feeds.

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